Extension-trestle



(No Muriel.)

J. E. WALLACE & O. D. vREESE.

EXTENSION TRESTLE.

No. 380,539. Patented Apr. 3, 1888.

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UNITED STATES PATENT QFFlCEQ JAMES E. YVALLAOE AND CHARLES D. REESE, OF LA CROSSE, WISCONSIN.

EXTENSiON-TRESTLE.

SPECIFICATION forming part of Letters Patent No. 380,539, dated April 3, 3.888.

(No mod cl.)

To (4Z5 whom it may concern:

Be it known that we, JAMES E. WALLAcE and OI-LiELEs D. REE-SE, of La. Orosse, Wisconsin, have invented certain Improvements in Extensioulrest-les, of which the following is a specification.

Our invention relates to an improvement in extension-trestles, designed especially for use by carpenters, masons, and other artisans; and the object of our invention is to provide atrestle which is adapted to he vertically and longitudinally adjusted, and which may be readily taken apart and erected.

To these ends the invention consists in the peculiar construction and combination of devices that will be hereinafter more fully set forth.

The accompanying drawing is a perspective view of our improved trestle.

A, B, and G represent a series of bars which overlap each other,the bars A G being arranged on one side of the bar B. Near one end of the bar B are secured a pair of rectangular metallic' guides or straps, D, which embrace the bar A, and near one end of the bar 0 are secured a pair of similar straps or guides, D, which embrace the bar B. By this means the bars A G' are secured firmly to the bar B, and are at the same time adapted to be moved longitudinally on said bar toward or from each other to adjust the trestle to any length required.

G represents three pairs of downwardly-diverging legs, which are attached to the center and opposite ends of the bars B A O, respectively. Each pair of legs G is connected by a crossbar, G, and braces G connect the said crossbars to the extensible bars. The lower end of each leg G is provided with a pair of rectangular straps or keepers, H, which are similar to the keepers or straps D D.

E represents extensions,which are arranged on the outer sides of the legs G and are guided by the straps or keepers H. To the outer side of each extension is secured a rack-bar, E, having a series of notches, as shown. Each of the legs G has a set-screw, I, the point of which is adapted to engage the proximate bar E, so as to force the same out-ward and cause the keepers or straps to engage the notches in the rackbar, and thereby secure the extension at any desired adjustment to the leg.

From the foregoing description it will be readily understood that the trestle maybe ad- V j usted longitudinally and vertically,and therei by adapted for use in a great variety, of circumstances.

Havingthus described our invention, we

The combinationgin atrestle, of the supporting-legs G, having the straps H rigidly secured thereto, the'extensions E, having the racks E on'the outer sides, said extensions being passed through the straps H and movable longitudinally on the legs G, and adapted to play loosely between the opposing sides of said legs and said straps, and the set-screws engaging threaded openings in legs G, and having their points bearing against the inner sides of the extensions, for the purpose set forth, substantially as described.

JAMES E. W'ALLAGE. CHARLES D. REESE.

\Vitnesses:

JOHN BRINDLEY, Jornv J. FRUIT. 

